I think you meant arugula? In any case, I must say I've tried arugula and couldn't figure what the fuss was all about -- it was just another bitter green leafy thing to put in salads. Angostura bitters, however, make a nice champagne cocktail, and of that I do approve.
When I think of bitter, I think Angostura. Once Obama has the prize snatched away form him, I anticipate a vaste outpouring of bitterness for a lot of disappointed true believers.